adallak Posted October 15, 2004 Report Share Posted October 15, 2004 Yesterday I replaced what appeared to be original Delco non-platinum spark plugs on my 4.9. I have measured the gap and it was 0.075 instead of original 0.060. The breakdown voltage in the area of gas densities typical for a combustion chamber should be fairly linear which means the threshold voltage should have increased by some 25%. Looks like that increase was within abilities of coils since the engine ran very well with original spark plugs. Just some "experimental data" for those who is interested. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 You are saying that you increased the gap because of not using platinum plugs? Personally I would have kept it the same, lets see that others have to say, .075 is large enough to drive a truck through it, I can't imagine that its helping your gas mileage or quickness at all. It must run like a dog! I don't think I have ever seen such a large gap. Can you explain why you increased the gap in more detail? I'm confused Link to comment Share on other sites More sharing options...
bigfoo Posted October 15, 2004 Report Share Posted October 15, 2004 He said he took out the old spark plugs and measured the gap and it was 0.075, not the new ones he just put in.. read again :> Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 You are saying that you increased the gap because of not using platinum plugs? Personally I would have kept it the same, lets see that others have to say, .075 is large enough to drive a truck through it, I can't imagine that its helping your gas mileage or quickness at all. It must run like a dog! I don't think I have ever seen such a large gap. Can you explain why you increased the gap in more detail? I'm confused Scotty, I did not increase anything the Caddy did in 13 years and 140.000 miles The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ranger Posted October 15, 2004 Report Share Posted October 15, 2004 I think he is saying they were eroded (worn) to .075 and still ran ok. Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 OH I SEE said the blind man!!! I thought he made the gap .075..... Thanks guys for clearing that up! Mike I said I was confused! Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 I think he is saying they were eroded (worn) to .075 and still ran ok EXACTLY Ranger - they ran great! The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 Adallak, how does it run now with the new plugs, .075 is huge it must be really snappy now with the new plugs at .060! Mike Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 Adallak, how does it run now with the new plugs, .075 is huge it must be really snappy now with the new plugs at .060! Mike Mike, I did not notice any change in the performance. Frankly, I was just curious about the history of the plugs on my car. Besides, I have never done plug job before, so I decided to go ahead and change them. Still have all those scratches on my both hands The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
bigfoo Posted October 15, 2004 Report Share Posted October 15, 2004 they really know how to pack it in there. It's almost as tight as my minivan Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 Adallak, how does it run now with the new plugs, .075 is huge it must be really snappy now with the new plugs at .060! Mike Mike, I did not notice any change in the performance. Frankly, I was just curious about the history of the plugs on my car. Besides, I have never done plug job before, so I decided to go ahead and change them. Still have all those scratches on my both hands I believe it, that is why I said to wear gloves, I got ripped to shreads when I did mine. I am surprised you dont feel a difference, maybe your gas mileage will be better. Now its time to get on that heater core! Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 I believe it, that is why I said to wear gloves, I got ripped to shreads when I did mine. I am surprised you dont feel a difference, maybe your gas mileage will be better. Mike, I drove to Rochester, NY (460 miles round-trip) two days ago for a conference and the average fuel economy was 26.5 with OLD ORIGINAL SPARK PLUGS! Now its time to get on that heater core! I replaced the heater core today, so don't need a balls defroster anymore! The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 26.5 MPG with .075 plugs! OMG, you must drive like an ole lady! Terrific you did your heater core! Heat for the winter...... PS, did you use the cooling system supplement? Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 26.5 MPG with .075 plugs! OMG, you must drive like an ole lady! Terrific you did your heater core! Heat for the winter...... PS, did you use the cooling system supplement? 230 miles in 3.5 hours. It does not sound like old lady to me ( 45-50 mph on back roads and 75-80 on high ways). The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Scotty Posted October 15, 2004 Report Share Posted October 15, 2004 26.5 MPG with .075 plugs! OMG, you must drive like an ole lady! Terrific you did your heater core! Heat for the winter...... PS, did you use the cooling system supplement? 230 miles in 3.5 hours. It does not sound like old lady to me ( 45-50 mph on back roads and 75-80 on high ways). That is incredible, especially with old plugs, do you have dilithium crystals and warp engines in that baby?! My gas mileage was never that good. Was the trip downhill in both directions? Maybe your tires were pumped up to 50 pounds? Link to comment Share on other sites More sharing options...
adallak Posted October 15, 2004 Author Report Share Posted October 15, 2004 QUOTE (adallak @ Oct 15 2004, 11:03 PM) QUOTE 26.5 MPG with .075 plugs! OMG, you must drive like an ole lady! Terrific you did your heater core! Heat for the winter...... PS, did you use the cooling system supplement? 230 miles in 3.5 hours. It does not sound like old lady to me ( 45-50 mph on back roads and 75-80 on high ways). That is incredible, especially with old plugs, do you have dilithium crystals and warp engines in that baby?! My gas mileage was never that good. Was the trip downhill in both directions? Maybe your tires were pumped up to 50 pounds? you forgot to mention the wind I believe the "secret" is that the tires are pretty close to safety indicators, the pressure was 32 psi when cold, and I use 89 not premium anymore, the oil was Valvoline Min-Life 10w-30 The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
JasonA Posted October 16, 2004 Report Share Posted October 16, 2004 Mike, FYI, some engines from the 1970s and 1980s had spark plug gaps of .080" from the factory, like the Oldsmobile V8s. I had to buy a "special" AC plug for that car, with an extended tip, to allow for the longer gap. R46SX if I recall correctly...the "X" meaning eXtended tip. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
adallak Posted October 18, 2004 Author Report Share Posted October 18, 2004 do you cover the plugs with dielectric grease? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Scotty Posted October 18, 2004 Report Share Posted October 18, 2004 do you cover the plugs with dielectric grease? I put a squirt in the boot before I snap it on Link to comment Share on other sites More sharing options...
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